exam Maths Puzzle Numerical Ability

a civia civiq group is building a sandbox that is enclosed by 1-foot wide railroad ties. The group needs to find the area inside the sandbox to find the amount of sand needed. Writ

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I would like to know if i did this problem correct. this problem is from a work sheet.
y=2x and y=2-1
_2=2(-1) and -2=-1-1
A plum and a pineapple cost the same as three peaches. Two plums cost the same as a peach. How many plums cost the same as a pineapple?